Air pollution refers to the introduction of substances into the atmosphere that inflict harm on the health of living things and degrade the quality of the environment. Exhaust from automobiles, emissions from industries, suspended particles and gases are among the unwanted substances that are deteriorating the quality of air around us.

Before we invented civilization our ancestors lived mainly in the open out under the sky. Before we devised artificial lights and atmospheric pollution and modern forms of nocturnal entertainment we watched the stars.

- Carl Sagan

Human beings have engineered the night so that we don't have to be in the dark anymore. However, its advantages are not without adverse effects which is known as light pollution.

Human beings never have to live in the dark anymore. Our surroundings are illuminated at night by various artificial lights. But with immoderate and extreme lighting use, we are faced with some damaging effects.

Light pollution refers to the excessive and unnecessary artificial lights that are introduced to the natural environment at night.

Air pollutants are the unwanted substances that enter the atmosphere from various natural and anthropogenic sources. These solid, liquid or gaseous substances can be harmful to our health and surroundings.

They are divided into

Primary Pollutants

Indoor air pollution is a term used to characterize the pollution of the air inside our homes, office workplaces and other living spaces. The extent of air pollution outside in urban cities and industrial areas is obvious to all of us.

But most of us are not aware of the dire condition of the air that we breathe inside our homes. In fact, the air inside is supposed to be more harmful to our health than the air outside.

Air pollution has now become a commonplace word in our lives. It is everywhere and people all over the world are experiencing adverse effects on their health due to the deteriorating quality of air.

The damaging consequences of polluted air are evident in every city around the world. Thick clouds of smog can be seen hanging in the horizon of urban cities which are being polluted by several indoor and outdoor sources.